A project build is the process of executing the toolchain assigned to the project. The end result should be a binary file per default placed in the Debug or Release folders of your project.
Depending on the project setup a one of the three build systems are used. Either the internal builder, managed make or standard make. If the standard make build system is being used all the required commands must be specified in the makefile.
A project build can be started by selecting Project > Build Project from the main menu or pressing Ctrl+B while a project file is open in the editor or selected. AVR32 Studio will attempt to detect which project you want built using the current selection.
AVR32 Studio will save files automatically when starting a build. This may cause undesirable results so if you don't want this behavior, go to preferences, General > Workspace and uncheck Save automatically before build.